Distance b/w object and its real image in convex lens is D and magnification in m find the focal length of lens?
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Answer:
f = d/(2-m-1/m)
In order for this formula to work, two things have to be taken care of:
The distance is taken from image to object, so image position minus object position (d = img-obj).
The magnification m is negative for inverted images (the usual case with convex lenses: projection, real inverted image)
Explanation:
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